Dual magnetoresistive reproduce head utilizing multilayer magnet

Details Dual magnetoresistive reproduce head utilizing multilayer magnet Dual magnetoresistive reproduce head utilizing multilayer magnet

1995-07-17

1997-05-06

Renner, Craig A.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 539

Patent

active

056277032

ABSTRACT:
A spin-valve dual magnetoresistance reproduce head (SV-DMR), consists of two spin valve sensor elements configured such that the two individual spin valve elements are physically separated by a relatively high resistivity conductive gap spacer. As in a conventional dual magnetoresistive head (DMR) there is sense current flow through the SV-DMR, and signal generated magnetoresistance changes are detected as head output voltage variations. The SV-DMR eliminates the need for an exchange coupled pinning layer or the mismatch of spin valve layers to implement the perpendicular biasing arrangement disclosed in the prior art. The required perpendicular biasing is attained solely by the interaction between substantially equal thickness magnetic layers of the SV-DMR and the internal magnetic fields arising from the flow of the sense current in the device. The inherent high resolution of the prior art DMR is retained in the SV-DMR, and is effectively combined with the high output signal capability provided by the use of spin valve magnetoresistance elements.

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